Here is a must for anyone in the shop. A universal magnetic base that will save time and improve accuracy. Strong magnet with 45 lbs. of holding power. Zinc die cast housing. Size: 4-1/2"x1"x1-1/4". 5 Different locations for mounting accessories: ...3 Position 1/4-20 for lug mounts. ...1 Tapped hole 10-32. ...1 Reamed hole 3/8" diameter. This is not the Mighty mag brand